Planted Tank Guru
Join Date: Jul 2010
Location: British Columbia, Canada
Not sure what you mean.
Do you have "The 'BAG' of Purigen which measures approx. 4" + X 2.5" or so ?
Is that bag too large to fit in into the filter compartment that you intend to place it in, and would you need to double it up (fold it over in 2) to get it to fit ?
(If you needed to double it like that, this would prevent water from readily flowing through the Purigen beads, thereby rendering it pretty much ineffective).
I don't think you can use too much Purigen, but you do need to use it properly for it to work. If you need the bag to be smaller, you might do one of 2 things: 1 - Carefully cut the bag to a size that would work without losing too many of the tiny beads, then re-sowing, or otherwise sealing, the open end back up very well to prevent the beads from escaping; or 2 - you can buy small fine mesh bags from a PetSmart store, cut them to size, double them up, fill them with Purigen beads removed from your bag, & re-seal the new container well with good string, or thread to ensure the beads won't escape.
(In the case of option # 1, the Purigen can be let loose into a suitably-sized dish, and enough of it put back into the re-sized bag that you've put together.)
This should work if you can understand the instructions.